Reciprocating device for spinning reel

ABSTRACT

An oscillating mechanism is for reciprocating a spool in a spool shaft direction in cooperation with rotation of a handle. The oscillating mechanism includes a slider member, a gear member, and a guide shaft. The slider member is mounted at least axially immovably to a spool shaft, on the fore end of which the spool is mounted. The gear member reciprocates the slider member in the shaft axial direction in cooperation with rotation of the handle. The guide shaft is supported at two locations of its outer circumferential surface with the reel unit, has an annular groove to which a retainer can be attached for preventing disengagement of the guide shaft in one axial direction, and guides the slider member in a direction substantially parallel to the spool shaft. In this way, structure for retaining a guide shaft is simplified and design constraint alleviated.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] This invention generally relates to reciprocating mechanisms. More specifically, the present invention relates to reciprocating mechanisms for spinning reels for reciprocating a spool mounted to a reel unit of a spinning reel along a spool shaft axis in cooperation with rotation of a handle.

[0003] 2. Background Information

[0004] A spinning reel that winds fishing line around the shaft that extends along the longitudinal direction of a fishing rod is provided with an oscillating mechanism (an example of reciprocating mechanism) for reciprocating a spool back and forth for winding fishing line. Among known examples of oscillating mechanism of this type are a gear-down type oscillating mechanism and a traverse cam type oscillating mechanism.

[0005] The gear-down type oscillating mechanism includes a gear member that rotates around an axis parallel to a handle shaft, and a slider member that reciprocates along a direction of the spool shaft by rotation of the gear member. The gear member meshes with a drive gear that is provided on a rotation shaft of the handle. A peripheral rim portion of one side face of the gear member has a cam lobe formed thereon. The slider member has a cam-engaging groove formed on its side face opposing the gear member such that the cam-engaging groove engages with the cam lobe. The cam-engaging groove generally extends linearly orthogonal to the spool shaft. To the slider member, a rear-end portion of the spool shaft is fixed, while the spool is mounted to the fore end of the spool shaft. The slider member is supported by a guide portion provided on the reel unit so as to be able to move freely back and forth.

[0006] In the gear-down type oscillating mechanism with this structure, when the gear member is rotated in cooperation with rotation of the handle, the cam lobe slides engaging with the cam-engaging groove, by which rotational motion of the gear member is converted into linear motion of the slider member. In this manner, the spool reciprocates back and forth.

[0007] The traverse cam type oscillating mechanism on the other hand includes a worm shaft arranged parallel to spool shaft and the engaging member having intersecting spiral grooves formed thereon, a slider member having an engaging member engaging with the worm shaft, and an intermediate gear fixed to the worm shaft and meshing with a pinion gear. The slider member is supported by a guide portion provided on the reel unit so as to be able to move freely back and forth.

[0008] In the traverse type oscillating mechanism with this structure, when the intermediate gear is rotated in cooperation with rotation of the handle, the worm shaft accordingly rotates. Then, the engaging member engaged with the worm shaft converts rotation of the worm shaft into forward and rearward liner motions for the slider member. In this manner, the spool reciprocates back and forth.

[0009] In either of the oscillating mechanisms, the configuration in which the guide portion for guiding the slider member along the spool axis is configured by a guide shaft that is arranged parallel to the spool shaft is known. The guide shaft is inserted from a through hole formed in a rear-end portion of the reel unit toward the front and is supported at two locations in the front and rear of the reel unit. The fore end of the guide shaft is coupled to the reel unit so as not to move further forward. The rear end of the guide shaft is prevented from disengaging in the axial direction by a plate-shaped retainer member that blocks the support portion at the rear end side from outside. The retainer member is secured to the reel unit with a screw, and the rear portion of the reel unit including the retainer member is covered by a cover member.

[0010] In the foregoing conventional configuration, the retaining member is mounted on the guide shaft at its rear end of its insertion direction with a screw in either type of the oscillating mechanism. This necessitates a retainer member and a fixing means such as a screw for fixing it, making the structure for retaining the guide shaft complicated and leading to a factor for increasing manufacturing cost of the mechanism. Moreover, since the retainer member needs to be fitted in the rear portion of the reel unit with a screw, space for fitting the retainer member is required in the rear portion, which restricts design of the reel unit.

[0011] In view of the above, there exists a need for a reciprocating mechanism of a spinning reel which overcomes the above mentioned problems in the prior art. This invention addresses this need in the prior art as well as other needs, which will become apparent to those skilled in the art from this disclosure.

SUMMARY OF THE INVENTION

[0012] Accordingly, a purpose of the present invention is to provide a reciprocating mechanisms of a spinning reels, whose structure for retaining the guide shaft is simplified such that constraints in designing the reel unit are reduced.

[0013] A spinning reel reciprocating mechanism according to the first aspect of the invention is a mechanism for axially reciprocating, in cooperation with rotation of a handle furnished on the spinning-reel reel unit, a spool mounted fore-end wise on a spool shaft provided in the reel unit. The spinning reel reciprocating mechanism includes a reel unit, a sliding member, shifting means, and at least one guide shaft. The handle and the spool shaft are furnished on the reel unit. The sliding member is mounted on the spool shaft immovably relative to the spool shaft in at least the spool shaft axial direction. The shifting means is for reciprocating the sliding member in the shaft axial direction in cooperation with handle rotation. At least one guide shaft is supported by the reel unit in a plurality of locations on at least its outer circumferential surface and has a position-restricting portion for preventing the guide shaft from being disengaged from the reel unit in at least one axial direction. The guide shaft is for guiding the sliding member in a direction substantially parallel to the spool shaft.

[0014] In this reciprocating mechanism, when the guide shaft is inserted from, for example, the rear of the reel unit, the outer circumferential surface is supported on the reel unit, and the position-restricting portion determines the position of the shaft with respect to at least one axial direction. Therefore, by retaining its fore end by the reel unit, the guide shaft is prevented from disengaging in both directions. Thus, the guide shaft is retained by the position-restricting portion. Therefore, complicated structures such as a retaining member fastened by a screw are unnecessary for the retaining. In addition, the retainer member needs not be fitted in the rear portion of the reel unit, which makes the space for mounting unnecessary. Thus, constraints in designing the reel unit are reduced.

[0015] A spinning reel reciprocating mechanism according to the second aspect of the invention is the mechanism as set forth in the first aspect, wherein the guide shaft is inserted, along the axial direction of the guide shaft, through a plurality of support portions aligned along the shaft axial direction in the reel unit, and its outer surface is entirely circumferentially supported by the plurality of support portions. The position-restricting portion has an annular groove and a retainer member that is fittable into the annular groove. The retainer member contacts one of the plurality of support portions, on a surface opposite where the guide shaft is inserted, to prevent disengagement in a direction opposite the direction in which the guide shaft is inserted. In this case, retaining in the insertion direction can be attained by contacting the fore end with the reel unit. In addition, by fitting an appropriate retaining member such as a snap ring into the annular groove, the guide shaft is easily prevented from disengaging in the insertion direction and the opposite direction.

[0016] A spinning reel reciprocating mechanism according to the third aspect of the invention is the mechanism as set forth in the second aspect, wherein the retainer member is a snap ring detachably and elastically locked in the annular groove. In this case, by fitting a C-shaped or E-shaped snap ring into the annular groove, the guide shaft is easily prevented from disengaging.

[0017] A spinning reel reciprocating mechanism according to the fourth aspect of the invention is the mechanism as set forth in the second aspect, wherein the retainer member is a retaining spring formed by bending a metal wire into a hairpin contour, and locked detachably and elastically in the annular groove. In this case, by fitting the retaining spring into the annular groove, the guide shaft is easily prevented from disengaging.

[0018] A spinning reel reciprocating mechanism according to the fifth aspect of the invention is the mechanism as set forth in the second aspect, wherein: the reel unit includes a reel body having a housing space in the interior thereof, and a lid member detachably fixed to the reel body and closing the housing space. The position-restricting portion includes an annular groove on an outer circumference of the guide shaft and a plate-shaped member that having a U-shaped groove that is detachably and reattachably fitted into the annular groove. The plate-shaped member is pressed toward the guide shaft by the lid member.

[0019] A spinning reel reciprocating mechanism according to the sixth aspect of the invention is the spinning reel reciprocating mechanism as set forth in any one of the second through fifth aspects, wherein the retainer member is contacting one of said plurality of support portions on a side closer to a side of said reel unit on which fishing line is reeled out. In other words, the guide shaft is inserted from a rear portion of the reel unit that is opposite a side thereof from which fishing line is reeled out. In this case, when the guide shaft is inserted from the rear portion of the reel unit, disengagement is prevented in the direction opposite the direction in which the guide shaft is inserted.

[0020] A spinning reel reciprocating mechanism according to the seventh aspect of the invention is the spinning reel reciprocating mechanism as set forth in any one of the second through sixth aspects, wherein the reel unit further includes a positioning boss, and the guide shaft comes into contact with the positioning boss when the guide shaft is inserted from the rear of the reel unit, such that an insertion direction position of the guide shaft is determined. In other words, the guide shaft is inserted from the rear of the reel unit, and a fore end thereof comes into contact with a positioning boss provided in the reel unit, whereby the guide shaft is positioned along the insertion direction. In this case, since the positioning boss prevents disengagement in the insertion direction, the guide shaft is more easily retained.

[0021] A spinning reel reciprocating mechanism according to the eighth aspect of the invention is the spinning reel reciprocating mechanism as set forth in any one of the second through sixth aspects, wherein: the guide shaft has an interlocking portion formed at a rear end portion thereof along the insertion direction, for interlocking with one of the support portions that is at rearmost end in the insertion direction. By interlocking of the interlocking portion into the support portion, the guide shaft is positioned along the insertion direction. In this case, the position-restricting portion prevents disengagement in the direction opposite the direction in which the shaft is inserted, and the engaging portion prevents disengagement in the insertion direction.

[0022] A spinning reel reciprocating mechanism according to the ninth aspect is the spinning reel reciprocating mechanism as set forth in the first aspect, wherein the reel unit has a plurality of support portions that are formed thereon and aligned along an axial direction. The guide shaft is inserted, along the axial direction of the guide shaft, through said plurality of support portions such that an outer surface of the guide shaft is entirely circumferentially supported by the plurality of support portions. The position-restricting portion includes two annular grooves into which two snap rings are fittable, the snap rings contacting both side surfaces on a one of the plurality of support portions, whereby the support portion is sandwiched by the snap rings to prevent disengagement in a direction in which the guide shaft is inserted and the opposite direction. In this case, portions of the guide shaft prevent it from disengaging in both direction, and therefore, the configuration is further simplified.

[0023] A spinning reel reciprocating mechanism according to the tenth aspect of the invention is the spinning reel reciprocating mechanism as set forth in any one of the first through ninth invention, wherein the sliding means includes: a rotating member having a cam, for rotating, in cooperation with rotation of the handle, around an axis substantially parallel to the handle rotational axis; and a cam-engaging groove, provided on the sliding member, engaging the cam and extending in a direction intersecting the direction of the spool shaft. In this case, structure for retaining the guide shaft can be simplified in gear-down type reciprocating mechanisms.

[0024] A spinning reel reciprocating mechanism according to the eleventh aspect of the invention is a mechanism as set forth in any one of the first through ninth aspects, wherein the shifting means includes: a worm shaft disposed substantially parallel to the spool shaft and intersecting spiral grooves that are formed on a surface of the worm shaft; an intermediate gear fixed to the worm shaft for transmitting rotation of the handle to the worm shaft; and an engaging member pivotably accommodated in the sliding member and engaging the worm shaft. In this case, structure for retaining the guide shaft can be simplified in traverse cam type reciprocating mechanisms.

[0025] These and other objects, features, aspects and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Referring now to the attached drawings which form a part of this original disclosure:

[0027]FIG. 1 is a side cross-sectional view of a spinning reel in accordance with one embodiment of the present invention;

[0028]FIG. 2 is a cross-sectional view of the spinning reel in accordance with the embodiment of the present invention viewed along line II-II of FIG. 1;

[0029]FIG. 3 is an enlarged cross-sectional view of the oscillating mechanism in accordance with the present invention;

[0030]FIG. 4 is a cross-sectional view of the oscillating mechanism in accordance with the embodiment of the present invention taken along line IV-IV of FIG. 1.

[0031]FIG. 5 is a schematic perspective view showing a mounting structure of the guide shaft in accordance with the embodiment of the present invention;

[0032]FIG. 6 is a front view of the first and the second cam portions in accordance with the embodiment of the present invention;

[0033]FIG. 7 is a cross-sectional view of the first and the second cam portions in accordance with the embodiment of the present invention viewed along line VI-VI of FIG. 6;

[0034]FIG. 8 is a view illustrating the shapes of the first and second cam-engaging slots in accordance with the embodiment of the present invention;

[0035]FIG. 9 is a schematic view showing the positional relationship between the slider member and the gear member of the oscillating mechanism in accordance with the embodiment of the present invention;

[0036]FIG. 10 is a graph showing the relationship between rotation positions of the gear member and traveling distance of the slider member;

[0037]FIG. 11 is a schematic perspective view corresponding to FIG. 5, showing a mounting structure of the guide shaft in accordance with another embodiment of the present invention;

[0038]FIG. 12 is a schematic perspective view corresponding to FIG. 5, showing a mounting structure of the guide shaft in accordance with still another embodiment of the present invention;

[0039]FIG. 13 is a schematic perspective view corresponding to FIG. 5, showing a mounting structure of the guide shaft in accordance with still another embodiment of the present invention;

[0040]FIG. 14 is a partial cross-sectional view of a traverse cam type oscillating mechanism in accordance with still another embodiment of the present invention; and

[0041]FIG. 15 is a cross-sectional view of the traverse cam type oscillating mechanism in accordance with the embodiment of FIG. 14, viewed along line XV-XV of FIG. 14.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] Selected embodiments of the present invention will now be explained with reference to the drawings. It will be apparent to those skilled in the art from this disclosure that the following description of the embodiments of the present invention is provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

[0043] Overall Configuration

[0044] A spinning reel in accordance with a first embodiment of the present invention, which is shown in FIG. 1, is a lever brake type reel that winds fishing line around a first axis X along the longitudinal direction of a fishing rod. The spinning reel includes a reel unit 2 provided with a handle 1, rotor 3 that is supported so as to be rotatable around the first axis X, and a spool 4 for winding fishing line and arranged in front of the rotor 3.

[0045] The reel unit 2 is made of, for example, a synthetic resin. The reel unit 2 has a mounting portion 2 c extending front to rear for mounting a fishing rod, a reel body 2 a arranged so as to have a clearance from the mounting portion 2 c, and a leg portion 2 b connecting the mounting portion 2 c and the reel body 2 a. The reel body 2 a has a mechanism-fitting space in the interior thereof, and its side portion has an opening. This opening is covered by a lid member 2 d (see FIGS. 2 and 4). On the front portion of the reel body 2 a, a cylindrical mounting member 2 e that has a mounting flange and is made of a metal is mounted.

[0046] The reel body 2 a accommodates, in the interior thereof, a rotor drive mechanism 5 for rotating the rotor 3, a lever brake mechanism 6 for braking rotation of the rotor 3 in a line reel-out direction (reverse rotation), and an oscillating mechanism (an example of reciprocating mechanism) 17 for reciprocating the spool 4 back and forth with a spool shaft 8.

[0047] The rotor 3 is made of, for example, a synthetic resin or a metal and is rotatably supported on the reel unit 2. The rotor 3 has a cylindrical portion 3 a, and a first arm portion 3 b and a second arm portion 3 c, both of which are provided at a side of the cylindrical portion 3 a so as to oppose each other. The inner circumference surface of the cylindrical portion 3 a that is on a front wall 3 d side has a saw-toothed, reverse rotation-preventing bump 31, which is part of a pawl-type one-way clutch 30 for transmitting rotation of the rotor 3 in a line reel-out direction to the lever brake mechanism 6. At the center of the front wall 3 d of the cylindrical portion 3 a, a boss portion 3 f having a through hole 3 e is formed. A spool shaft 8 and a pinion gear 12, which is described later, pass through the through hole 3 e. A bail arm 9 is provided pivotably on the fore end of the first arm portion 3 b and the fore-end portion of the second arm portion 3 c. This bail arm 9 guides the fishing line onto the spool 4.

[0048] The spool 4 is, for example, of a hybrid type made of a combination of a synthetic resin and a metal. The spool 4 is arranged between the first arm portion 3 b and the second arm portion 3 c of the rotor 3 and is mounted detachably and non-rotatably to the fore end of the spool shaft 8 with a one-touch attaching-and-detaching mechanism 53. The spool 4 has a spool body 7 having a bobbin trunk portion 7 a, a large diameter front flange portion 51 attached onto the fore-end portion of the bobbin trunk portion 7 a, and a front flange-securing member 52 for securing the front flange portion 51 to the spool body 7. The spool body 7 has the cylindrical bobbin trunk portion 7 a onto the outer periphery of which fishing line is wound, a large diameter cylindrical skirt portion 7 b integrally formed with the rear-end portion of the bobbin trunk portion 7 a, and an internal cylinder member 7 c attached on the inner peripheral side of the bobbin trunk portion 7 a.

[0049] The bobbin trunk portion 7 a and the skirt portion 7 b are tubular, larger-smaller dual-stage components integrally formed by press-working with, for example, a thin sheet of aluminum alloy, titanium alloy, stainless alloy, magnesium alloy, or the like.

[0050] The rotor drive mechanism 5 has, as shown in FIG. 1, a master gear 11 that rotates with the handle shaft 10 onto which the handle 1 is fixed, and a pinion gear 12 that meshes with the master gear 11. The handle shaft 10 is rotatably supported on the reel unit 2. The pinion gear 12 is formed to have a cylindrical shape, and a front portion 12 a thereof extends toward the spool 4 side, passing through the through hole 3 e in the rotor 3. With this front portion 12 a, the rotor 3 is non-rotatably secured to the pinion gear 12 by a nut 13. The pinion gear 12 is rotatably supported on the reel unit 2 at its front portion and mid-portion by bearings 14 a and 14 b. The bearing 14 a for the front portion is attached onto the inner circumference surface of the mounting member 2 e, which is a component of the reel unit 2. The nut 13 is locked by a retainer 32. The retainer 32 is fixed by a screw that is screw-fastened into a screw hole formed in the front wall 3 d.

[0051] The lever brake mechanism 6 has, as shown in FIG. 1 and FIG. 2, a brake portion 60 for braking rotation of the rotor 3 in a line reel-out direction, a brake lever 61 for adjusting and manipulating braking force of the brake portion 60, an auxiliary lever 62 for operating the brake portion 60 to be in a predetermined braking state, a coil spring 63 for urging the brake lever 61 in a direction in which it detaches from the mounting portion 2 c, a brake portion 64 (see FIG. 2) that can be switched between a predetermined braking state and a predetermined brake releasing state by the auxiliary lever 62, and a sounding device 65 (see FIG. 2) that produces sound by reverse rotation of the rotor 3.

[0052] Configuration of Oscillating Mechanism

[0053] The oscillating mechanism 17 is, as shown in FIGS. 3 and 4, a device that causes a spool shaft 8, which is secured to the spool 4 at its center, to move back and forth so that the spool 4 moves in the same direction. The oscillating mechanism 17 is of gear-down type and has a gear member 15 that rotates in cooperation with the master gear 11, a slider member 16 that reciprocates in a spool shaft direction in cooperation with rotation of the gear member 15, and a guide 19 that guides the slider member 16 in a direction parallel to the spool shaft.

[0054] The gear member 15 is mounted on a wall surface of the reel body 2 a so as to be rotatable around an axis substantially parallel to the handle shaft 10. The gear member 15 meshes with a drive gear 11 b formed on a shaft portion 11 a of the master gear 11. A portion of the peripheral rim of the gear member 15 that is on a side face thereof opposing the slider member 16 is provided with a cam 21 having a first cam portion 21 a and a second cam portion 21 b protruding toward the slider member 16.

[0055] As shown in FIGS. 3, 4, 6, and 7, the first cam portion 21 a protrudes toward the slider member 16 from a side face of the gear member 15 and is located radially more outward than the second cam portion 21 b. The second cam portion 21 b has substantially the same width as that of the first cam portion 21 a, and a slightly shorter radial length than that of the first cam portion 21 a. The second cam portion 21 b protrudes further toward the slider member 16 than the first cam portion 21 a. A diametrically outside engaging surface 24 a of the first cam portion 21 a has a semicircular shape while an inner engaging surface 24 b has a concaved circular surface that is larger in diameter than that of the engaging surface 24 a. A diametrically outside engaging surface 25 a of the second cam portion 21 b has a triangular shape having a rounded fore end, while an inside engaging surface 25 b has a linear shape. Both of the ends of the inside engaging surface 25 b are slightly rounded. The second cam portion 21 b protrudes further from the first cam portion 21 a toward the slider member 16 in a step-wise manner. Both cam portions 21 a and 21 b are formed at the same circumferential position on the gear member 15.

[0056] The slider member 16 is supported by the guide 19 so that it can reciprocate in an axial direction parallel to the spool shaft 8. The slider member 16 is secured to the rear end of the spool shaft 8 non-rotatably and axially immovably by two flat head screws 18.

[0057] The guide 19 has, as shown in FIGS. 3 and 5, a first guide portion 33 formed on an upper portion of the reel body 2 a and a second guide portion 34 arranged at the bottom of the reel body 2 a.

[0058] The first guide portion 33 is formed on an upper inner wall of the reel body 2 a so as to protrude toward the lid member 2 d side and contacts slidingly with a guiding piece 16 a so that the slider member 16 is guided in the spool shaft direction.

[0059] The second guide portion 34 has a guide shaft 35 arranged parallel to the spool shaft 8. The guide shaft 35 is supported at two locations of its outer circumferential surface, which are a rear wall portion 37 and a mid wall portion 38 of the reel body 2 a.

[0060] The rear wall portion 37 and the mid wall portion 38 have through holes 37 a (an example of interlocking portion) and 38 a (an example of support portion) formed therein for the guide shaft 35 to pass through. The guide shaft 35 is inserted from the through hole 37 a. The guide shaft 35 passes through a through hole 16 c formed in a guide piece 16 b of the slider member 16 that protrudes downward, and further through a through hole 38 a, so as to be mounted onto the reel body 2 a. Specifically, the guide shaft 35 is mounted into the interior of the reel body 2 a from the rear.

[0061] The outer circumferential surface of the guide shaft 35 that faces a front side wall surface 38 b of the mid wall portion 38 (which is a surface on a far side from where the guide shaft is inserted) has an annular groove 35 a formed thereon, which serve as a position restricting portion. On the annular groove 35 a, an E-shaped snap ring 36 is attached, by which the guide shaft 35 is prevented from disengaging. The fore end of the guide shaft 35 is prevented from detaching by making contact with a fore-end wall portion 39 formed in front of the mid wall portion 38 of the reel body 2 a. In other words, the fore-end wall portion 39 prevents the guide shaft 35 from disengaging in an insertion direction, and the E-shaped snap ring 36 prevents it from disengaging in a direction opposite to the insertion direction by making contact with the front side wall surface 38 b of the mid wall portion 38.

[0062] When the retaining structure of this kind is employed, the guide shaft 35 can be prevented from disengaging with the E-shaped snap ring 36 attached to the annular groove 35 a. Therefore, it is no longer necessary to use complicated structures such as a retainer member fixed by a screw to prevent disengagement. Thus, retaining structure for the guide shaft 35 can be simplified. Moreover, since the need for attaching a retainer member at the rear of the reel unit 2 is eliminated, the space for mounting the retainer member becomes unnecessary, reducing constraints in designing the reel unit 2.

[0063] As shown in FIG. 7, a first cam-engaging slot 22 a and a second cam-engaging slot 22 b, which respectively engage the first cam portion 21 a and the second cam portion 21 b of the gear member 15, are formed on a side face of the slider member 16 that opposes the gear member 15. Engagement of the first cam portion 21 a and the first cam-engaging slot 22 a and engagement of the second cam portion 21 b and the second cam-engaging slot 22 b realizes a high-speed cam and a slow speed cam, respectively.

[0064] A cam-engaging groove 22, which is a through-bore, is formed in the slider member 16 along an axial direction which is parallel to the rotation shaft axis of the gear member 15. The flat head screws 18 are screwed from the lid member 2 d side, which is on the left hand side in FIG. 4, into the spool shaft 8. The flat head screws 18 are disposed at both sides of the slider member 16 sandwiching the bored-through cam-engaging groove 22.

[0065] Because the slider member 16 is thus fixed to the spool shaft 8 at two locations, even though the cam-engaging groove 22 is bored therethrough, the slider member 16 is reinforced by the spool shaft 8 and the relative strength of the slider member 16 is maintained high. Therefore, the cam-engaging groove 22 is not easily deformed even when pressed by the cam 21. For this reason, even when the bored-through cam-engaging groove 22 is provided in the slider member 16, it is possible to suppress reduction in transmission efficiency from the gear member 15 to the slider member 16.

[0066] Both slots 22 a and 22 b extends, as shown in FIG. 8, in a first axis Y1 direction orthogonal to the shaft axis X of the spool shaft 8; the slots have symmetrical shapes with respect to the first axis Y1 and are formed to align in the direction in which the first and the second cam portions 21 a and 21 b protrude. Both slots 22 a and 22 b also have symmetrical shapes with respect to a second axis X1, which is orthogonal to the first axis Y1 and passing through the rotation shaft axis of the gear member 15. The first cam engaging slot 22 a has a length greater than that of the second cam-engaging slot 22 b along the direction orthogonal to the spool shaft 8 because the first cam engaging slot 22 a needs to engage with the first cam portion 21 a.

[0067] The first cam-engaging slot 22 a includes first semicircular portions 26 a formed at both ends of the axis orthogonal to the spool shaft 8, first opposing portions 26 b formed so as to be concaved slightly outwardly from the first semicircular portions 26 a toward the second axis, and first inclined portions 26 c formed so as to incline and be concaved slightly outwardly such that the gap narrows gradually from the first opposing portions 26 b toward the center of the slot 22 a. Among these, the first semicircular portions 26 a and the first opposing portions 26 b should be such shapes that the first cam portion 21 a does not engage therewith. More specifically, the first semicircular portions 26 a and the first opposing portions 26 b do not necessarily need to be semicircular shapes or slightly concaved shapes. The first semicircular portions 26 a and the first opposing portions 26 b may be in any other shapes. The portions from the boundary between the first opposing portions 26 b and the first inclined portions 26 c toward the first inclined portions 26 c engage with the first cam portion 21 a, and the shape thereof is an important factor regarding traveling speed of the slider member 16.

[0068] The second cam-engaging slot 22 b includes: second semicircular portions 27 a formed at both ends of the axis intersecting the spool shaft 8 so as to have a smaller diameter than the first semicircular portion 26 a; second opposing portions 27 b formed parallel to each other from the second semicircular portion 27 a and extending toward the second axis X1; and second inclined portions 27 c formed parallel to each other and orthogonally intersecting the second axis X1 at both sides of the second axis X1 so as to be inclined so that the gap gradually widens from the second opposing portions 27 b toward the second axis X1 and that the gap is wider than that between the first inclined portions 26 c. The second inclined portions 27 c have such shapes that the engaging surface 25 b of the second cam portion 21 b can always engage therewith when the engaging surface 24 a of the first cam portion 21 a is engaged with the first cam-engaging slot 22 a.

[0069] The gap between the second opposing portions 27 b is substantially equal to or slightly larger than the width of the second cam portion 21 b. The gap of one of the first inclined portions 26 c at one side and one of the second incline portions 27 c at the other side is, at its center (on the second axis X1), substantially equal to or slightly larger than the length from engaging surface 24 a of the first cam portion 21 a to the engaging surface 25 b of the second cam portion 21 b. The engagement of the first cam portion 21 a and the first cam-engaging slot 22 a switches over to the engagement of the second cam portion 21 b and the second cam-engaging slot 22 b, so that rotational motion of the gear member 15 is converted to reciprocating linear motion of the slider member 16; consequently, the spool 4 reciprocates in the spool shaft axis X.

[0070] Here, the proportion of conversion from rotational motion to reciprocating motion in the high-speed cam resulting from engagement of the first cam-engaging slot 22 a and the first cam portion 21 a that is positioned radially outwardly is greater than that in the slow speed cam resulting from engagement of the second cam portion 21 b and the second cam-engaging slot 22 b. For this reason, the rotational motion can be converted into a motion close to uniform linear motion by switching between the two types of cams as follows; engagement with the high-speed cam takes place at rotational positions 45 degrees forward and backward from both ends of the slider member 16's traveling range, in which traveling speed of the slider member 16 is slow, whereas engagement with the slow speed cam takes place at rotational positions 45 degrees forward and backward in the mid range, in which the traveling speed is high. In addition, when engagement with the first cam portion 21 a takes place, by the provision of the first inclined portions 26 c where the gap therebetween narrows the traveling distance is increased as the slider moves toward both ends of the traveling range so that uniform linear motion can be maintained.

[0071] Reel Handing and Operation

[0072] When casting, the bail arm 9 is flipped over to a line-releasing posture while fishing line is being hooked with the index finger.

[0073] When retrieving fishing line, the bail arm 9 is flipped over to a line-retrieving posture. Under this condition, when the handle 1 is rotated in the line reel-in direction, the torque is transmitted through the handle shaft 10 and the master gear 11 to the pinion gear 12. The torque transmitted to the pinion gear 12 is then transmitted to the rotor 3 via the front portion 12 a of the pinion gear 12.

[0074] Meanwhile, accompanied by rotation of the master gear 11, the gear member 15 of the oscillating mechanism 17 that meshes with the drive gear 11 b rotates. Accordingly, the rotation is transmitted to the slider member 16 by either one of the cam portion 21 a or 21 b. As a result, the slider member 16 reciprocates along the axial direction X of the spool shaft 8.

[0075] In this situation, as shown in FIG. 9(a), when the slider member 16 has returned from a forward position to a mid position, the first and the second cam portions 21 a and 21 b are located in an upper position and the spool is located at a mid position. Under this condition, the first cam portion 21 a is at the top point (central position) of one of the first semicircular portions 26 a of the first cam-engaging slot 22 a. In this state, traveling distance L is 0, where traveling distance L is a traveling distance from the center of the gear member 15 to the slider member 16 along the fore and aft axis.

[0076] Under this condition, when the handle 1 is rotated in the line reel-in direction, the gear member 15 rotates clockwise of FIG. 9, as indicated by arrow Y. FIG. 9 depicts change in engagement state at every 9 degrees rotation, until the gear member 15 rotates 90 degrees. Here, until the gear rotates to a 45-degree rotational position shown in FIG. 9(f), the second cam portion 21 b engages with the second cam-engaging slot 22 b so as to reduce the traveling speed relative to rotation. Specifically, when the gear member 15 starts to rotate from the position shown in FIG. 9(a), at which the slider member 16 is at the mid position in its traveling range, the first cam portion 21 a gradually disengages from the first cam-engaging slot 22 a; then, the second cam portion 21 b becomes engaged with the second cam-engaging slot 22 b, and using the slow speed cam, the engaging surface 25 a of the second cam portion 21 b presses the second cam-engaging slot 22 b, thus gradually moving the slider member 16 backwards.

[0077] Then, when the gear rotates to a 45-degree rotational position shown in FIG. 9(f), the first cam portion 21 a becomes engaged with the first opposing portion 26 b of the first cam-engaging slot 22 a, and using the high-speed cam resulting from the engagement of the first cam portion 21 a and the first cam-engaging slot 22 a, the first cam portion 21 a presses the slider member 16 to move. Specifically, at the 45-degree rotational position shown in FIG. 9(f), switching from the slow speed cam to the high-speed cam takes place. Then, the engaging surface 24 a of the first cam portion 21 a engages with the first inclined portion 26 c of the first cam-engaging slot 22 a, pressing the slider member 16. This first inclined portion 26 c has an inclined surface so that the gap gradually narrows, and therefore has a function of maintaining the traveling speed at a uniform speed relative to rotation of the gear member 15. Thus, uniform linear motion is maintained to the rear end of the traveling range. When reaching the rear end position shown in FIG. 9(k), the engaging surface 24 a of the first cam portion 21 a comes into contact with the first cam-engaging slot 22 a and also the engaging surface 25 b of the second cam portion 21 b comes into contact with the second cam-engaging slot 22 b. It should be noted that during these movements, the engaging surface 25 b of the second cam portion 21 b is in contact with the second cam-engaging slot 22 b at all times. This reduces chattering of the slider member 16 when it travels.

[0078]FIG. 10 shows change in traveling positions of the slider member 16 when the gear rotates one revolution. In FIG. 10, the vertical axis represents traveling distances L of the slider member 16 from the mid position, while the horizontal axis represents rotational positions of the gear member 15 from the rearmost position. For convenience, the traveling stroke of the spool here is set to be 15 mm. The rotational positions in a range of from 270 degrees to 360 degrees shown in FIG. 10 represent the traveling speeds of the slider member 16 when it travels as shown in FIG. 9. In the conventional gear-down type oscillating mechanism using engagement pin, this graph produces a cosine curve, but in the present embodiment, the graph is almost a linear function. Therefore, the contour of wound line can be improved to a near flat shape.

[0079] When the slider member 16 reaches the rear end position in the traveling range, the engaging surface 25 b of the second cam portion 21 b comes into contact with the inclined surface 27 c of the second cam-engaging slot 22 b, pressing the slider member 16 to move forward. At this moment, the engaging surface 24 a of the first cam portion 21 a is engaged with the first cam-engaging slot 22 a. Therefore, until the process returns from FIG. 9(k) to Figure (f), the first cam portion 21 a engages with the first cam-engaging slot 22 a, moving the slider member 16 using the high-speed cam relative to rotation. Then, when reaching the mid position between FIG. 9(f) and FIG. 9(a), the slow speed cam, constituted by the second cam portion 21 b and the second cam-engaging slot 22 b, is used to move the slider member 16.

[0080] Herein, the slow speed cam is employed in an angular range of 45 degrees forward and rearward from the mid position, while the high-speed cam is employed in a range outside thereof toward either end, and moreover, when employing the high speed cam, the first inclined portion 26 c of the first cam-engaging slot 22 a is used to maintain uniform linear motion. As a result, a state near uniform linear motion is achieved as a whole. For this reason, the contour of wound line can be improved with a simple configuration using no excess components, while reducing transmission loss.

[0081] In addition, since the slider member 16 is fixed to the spool shaft 8 at two locations with the flat head screws 18 sandwiching the cam engaging groove 22, the slider member 16 is reinforced by the spool shaft 8 so that its relative strength can be maintained high. Accordingly, the cam engaging groove 22 does not easily deform even when pressed by the cam 21. For this reason, reduction in transmission efficiency from the gear member 15 to the slider member 16 can be reduced even when the bored-through cam engaging groove 22 is provided in the slider member 16.

[0082] Furthermore, because of the guide shaft 35, which guides the slider member 16, chattering of the slider member 16 is reduced and the slider member 16 is smoothly guided. In addition, the guide shaft 35 is prevented from disengaging in a direction opposite to the insertion direction with the E-shaped snap ring 36 attached to the annular groove 35 a. Therefore, it is unnecessary to use complicated structures such as retainer members fixed by screws for preventing disengagement. Thus, retaining structure for the guide shaft can be simplified. Further, it is unnecessary to mount a retainer member at the rear of a reel unit, eliminating the need for providing the mounting space therefor, which reduces constraints in designing a reel unit.

[0083] Other Embodiments

[0084] (a) The foregoing embodiment describes an example in which the guide shaft 35 is mounted from the rear, but the present invention may be applied to cases in which the guide shaft 35 is inserted from the front of the reel. For example, as shown in FIG. 11, it is possible to support the outer circumferential surface of the guide shaft 35 by the through hole 38 a that is formed in the mid wall portion 38 and a supporting hole 37 c that is formed in the rear wall portion 37 and does not bore therethrough. At the same time, it is possible to prevent the guide shaft 35 from disengaging in the insertion direction by the bottom of the supporting hole 37 c. In this case, the annular groove 35 a is formed on the outer circumferential surface facing a rear side wall surface 38 c of the mid wall portion 38 (a side opposite from where it is inserted). The annular groove 35 a is fitted with the E-shaped snap ring, by which disengagement of the guide shaft 35 in a direction opposite to the insertion direction is prevented.

[0085] (b) In the foregoing embodiment, the E-shaped snap ring is employed as a retainer member. However, the retainer member may be other kinds of retaining rings, such as a C-shaped snap ring, insofar as they can be fitted into the annular groove. Moreover, as shown in FIG. 12, a retaining spring 40 may be used that is formed by bending a metal wire into a hairpin shape. In the embodiment shown in FIG. 12, the annular groove 35 a is formed on the outer circumferential surface that faces a front side wall surface 37 b of the rear wall portion 37 (a side opposite from where it is inserted). Thus, the location of the annular groove 35 a may be any locations insofar the location faces a surface of a support portion supporting the guide shaft 35 that is opposite to where it is inserted.

[0086] (c) In the foregoing embodiment, the position-restricting portion was made up of the annular groove, but it may be configured by, for example, a regulating hole radially passing through the guide shaft. In this case, disengagement may be prevented by inserting, for example, a split pin into the regulating hole.

[0087] (d) In the foregoing embodiment, disengagement is prevented by the retainer member in only a direction opposite to where the shaft is inserted, but it is possible to prevent disengagement in both directions by the position-restricting portion. For example, as shown in FIG. 13, annular grooves 35 a and 35 b may be formed on an outer circumferential surface facing the front side wall surface 37 b of the rear wall portion 37 and a circumferential surface facing the rear side wall surface 38 c of the mid wall portion, and E-shaped snap rings 36 may be fitted into the annular groove 35 a and 35 b. In this case, it becomes unnecessary to provide a structure for retaining in the reel body 2 a.

[0088] (e) In the foregoing embodiment, a gear-down type oscillating mechanism is illustrated as an example, but the present invention may be applied to traverse cam type oscillating mechanisms.

[0089] Referring to FIGS. 14 and 15, an oscillating mechanism 106 is a mechanism for reciprocating in a forward and backward directions a spool shaft 115 connected to a spool (not shown) at its center through a drag mechanism (not shown) to reciprocates the spool in the same direction. The oscillating mechanism 106 has a worm shaft 120 arranged below and parallel to the spool shaft 115, a slider member 121 moving in the forward and backward directions along the worm shaft 120, an intermediate gear 122 fixed on the fore end of the worm shaft 120, and two guide shafts 123 a and 123 b guiding the slider member 121 in the spool shaft direction.

[0090] The worm shaft 120 has intersecting spiral grooves 120 a formed on its outer circumferential surface. On the rear end of the worm shaft 120, a first bearing 117 a is fitted that is mounted to the rear wall portion 116, and on the fore-end thereof, a second bearing 117 b is fitted that is mounted to the front wall portion 127. The first bearing 117 a can be fitted from the front of the rear wall portion 116. The second bearing 117 b can be fitted from the rear of the front wall portion 127. Both bearings 117 a and 117 b for supporting rotation are, for example, bushings made of a synthetic resin such as a polyacetal resin.

[0091] The rear end of the spool shaft 115 is non-rotatably fixed to the slider member 121 by two screws 121 c and 121 d. In the interior of the slider member 121, an engaging member 124 engaging with the spiral grooves 120 a is fitted so as to freely pivot around an axis orthogonal to the worm shaft 120. By engagement of this engaging member 124 with the spiral grooves 120 a, rotation of the worm shaft 120 is converted into reciprocation motion of the slider member 121.

[0092] The intermediate gear 122 meshes with a pinion gear 112. The worm shaft 120 and the guide shafts 123 a and 123 b, which are arranged parallel to and above and below the worm shaft 120, pass through the slider member 121. These guide shaft 123 a and 123 b guide the slider 121 in the forward and backward directions in the reel unit 2.

[0093] The worm shaft 120 and the guide shafts 123 a and 123 b are fitted from the rear through through-holes 140, 150 a, and 150 b that are formed in the rear portion of the reel body 102 a. These through holes 140, 150 a, and 150 b are covered by a cover member 151. The outer circumferential surfaces of the guide shafts 123 a and 123 b that face the front face of the rear wall portion 116 have annular grooves 135 a and 135 b for preventing disengagement, respectively. A plate-shaped retainer member 130 is fitted into the annular grooves 135 a and 135 b. In the retainer member 130, a pair of U-shaped first retaining grooves 130 a and 130 b disposed above and below and fitted on the annular groove 135 a and 135 b, and a U-shaped second retaining groove 130 c fitted to worm shaft 120 so as to retain the first bearing 117 a are formed. The retainer member 130 is secured by being pressed by a lid member (not shown) screw-fastened to the reel body 102 a.

[0094] With the retaining structure thus configured, the strength can be maintained higher than preventing disengagement by screw-fastening the retainer member on the rear face side of the rear wall portion, and moreover, assembling cost can be reduced since screw fastening becomes unnecessary.

[0095] (f) In the foregoing embodiment, disengagement of the guide shaft in the insertion direction is prevented by contact of the fore end of the guide shaft, but disengagement in the insertion direction may be achieved by providing a brim on the guide shaft.

[0096] Under the present invention, preventing the guide shaft from disengaging can be achieved by a position-restricting portion, and therefore, it is no longer necessary

[0097] to prevent disengagement using complicated structures such as retainer members fixed by screws, and retaining structure for the guide shaft can be simplified. Moreover, since a retainer member needs not be fit at the rear of the reel unit, the space for mounting is unnecessary, and design constraints for the reel unit are reduced.

[0098] As used herein, the following directional terms “forward,” “rearward,” “above,” “downward,” “vertical,” “horizontal,” “below” and “transverse” as well as any other similar directional terms refer to those directions of a device equipped with the present invention. Accordingly, these terms, as utilized to describe the present invention should be interpreted relative to a device equipped with the present invention.

[0099] The terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. These terms should be construed as including a deviation of at least ±5% of the modified term if this deviation would not negate the meaning of the word it modifies.

[0100] This application claims priority to Japanese Patent Application No. 2002-245686. The entire disclosure of Japanese Patent Application No. 2002-245686 is hereby incorporated herein by reference.

[0101] While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. Furthermore, the foregoing description of the embodiments according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 

What is claimed is:
 1. A spinning reel reciprocating mechanism for axially reciprocating a spool in cooperation with rotation of a handle, the spool being mounted fore-end wise on a spool shaft, the spinning reel reciprocating mechanism comprising: a reel unit on which the handle and the spool shaft are furnished; a sliding member adapted to be mounted on the spool shaft immovably relative to the spool shaft at least in the spool shaft axial direction; shifting means for reciprocating said sliding member in the spool shaft axial direction in cooperation with rotation of the handle; and at least one guide shaft adapted to be supported by said reel unit in a plurality of locations on an outer circumferential surface of said guide shaft for guiding said sliding member in a direction substantially parallel to the spool shaft, said guide shaft having a position-restricting portion for preventing said guide shaft from being disengaged from said reel unit in at least one axial direction of said guide shaft.
 2. The spinning reel reciprocating mechanism as set forth in claim 1, wherein: said reel unit has a plurality of support portions that are formed thereon so as to be aligned, said guide shaft being inserted along the axial direction of said guide shaft, through said plurality of support portions such that an outer surface of said guide shaft is entirely circumferentially supported by said plurality of support portions; and said position-restricting portion includes an annular groove formed on said outer circumference of said guide shaft and a retainer member detachably and reattachably fitted to said annular groove, said retainer member contacting a side of one of said plurality of support portions opposite a side from which said guide shaft is inserted, such that disengagement of said guide shaft from said support portions is prohibited in a direction opposite the direction in which said guide shaft is inserted into said support portions.
 3. The spinning reel reciprocating mechanism as set forth in claim 2, wherein said retainer member is a snap ring detachably and elastically locked in said annular groove.
 4. The spinning reel reciprocating mechanism as set forth in claim 2, wherein said retainer member is a retaining spring formed by bending a metal wire into a hairpin contour, and locked detachably and elastically in said annular groove.
 5. The spinning reel reciprocating mechanism as set forth in claim 1, wherein: said reel unit includes a reel body having a housing space in the interior thereof, and a lid member detachably fixed to said reel body and closing said housing space; and said position-restricting portion includes an annular groove formed on an outer circumference of said guide shaft and a plate-shaped member having a U-shaped groove that is detachably and reattachably fitted to said annular groove, said plate-shaped member being pressed toward said guide shaft by said lid member.
 6. The spinning reel reciprocating mechanism as set forth in claim 2, wherein said retainer member is contacting one of said plurality of support portions on a side closer to a side of said reel unit on which fishing line is reeled out.
 7. The spinning reel reciprocating mechanism as set forth in claim 2, wherein said reel unit further includes a positioning boss, said guide shaft comes into contact with said positioning boss when said guide shaft is inserted from the rear of said reel unit, such that an insertion-direction position of said guide shaft is determined.
 8. The spinning reel reciprocating mechanism as set forth in claim 2, wherein: said guide shaft has an interlocking portion formed at an insertion-direction rear end portion, said interlocking portion interlocking with one of said plurality of support portions that is at rearmost end in the insertion direction; and by interlocking of said interlocking portion into said support portion, an insertion-direction position of said guide shaft is determined.
 9. The spinning reel reciprocating mechanism as set forth in claim 1, wherein: said reel unit has a plurality of support portions that are formed thereon and aligned along an axial direction, said guide shaft being inserted, along the axial direction of said guide shaft, through said plurality of support portions such that an outer surface of said guide shaft is entirely circumferentially supported by said plurality of support portions; and said position-restricting portion includes two annular grooves and two snap rings that are detachably and reattachably fitted to said annular grooves, said snap rings contacting both side surfaces of one of said plurality of support portions, such that said support portion is sandwiched by said snap rings, and disengagement of said guide shaft from said support portion is prevented in either axial direction.
 10. The spinning reel reciprocating mechanism as set forth in claim 1, wherein said sliding means includes a rotating member having a cam, said rotating member being adapted to rotate around an axis substantially parallel to a rotational axis of the handle, in cooperation with rotation of the handle, and a cam-engaging groove provided on said sliding member and extending in a direction intersecting a direction of the spool shaft, said cam-engaging groove engaging said cam.
 11. The spinning reel reciprocating mechanism as set forth in claim 1, wherein said shifting means includes a worm shaft disposed substantially parallel to the spool shaft, intersecting spiral grooves being formed on a surface of said worm shaft; an intermediate gear fixedly coupled to said worm shaft, said intermediate gear transmitting rotation of the handle to said worm shaft; and an engaging member pivotably accommodated in said sliding member and engaging said worm shaft.
 12. A spinning reel, comprising: a reel unit provided with a handle and a spool shaft; a rotor supported so as to be rotatable around said spool shaft; a spool arranged in front of said rotor for winding fishing line, said spool being mounted fore-end wise on said spool shaft; a sliding member adapted to be mounted on the spool shaft immovably relative to the spool shaft at least in the spool shaft axial direction; shifting means for reciprocating said sliding member in the spool shaft axial direction in cooperation with rotation of the handle; and at least one guide shaft adapted to be supported by said reel unit in a plurality of locations on an outer circumferential surface of said guide shaft for guiding said sliding member in a direction substantially parallel to said spool shaft, said guide shaft having a position-restricting portion for preventing said guide shaft from being disengaged from said reel unit in at least one axial direction.
 13. The spinning reel as set forth in claim 12, wherein: said reel unit has a plurality of support portions that are formed thereon so as to be aligned, said guide shaft being inserted, along the axial direction of said guide shaft, through said plurality of support portions such that an outer surface of said guide shaft is entirely circumferentially supported by said plurality of support portions; and said position-restricting portion includes an annular groove formed on said outer circumference of said guide shaft and a retainer member detachably and reattachably fitted to said annular groove, said retainer member contacting a side of one of said plurality of support portions opposite a side where said guide shaft is inserted, such that disengagement of said guide shaft from said support portions is prohibited in a direction opposite the direction in which said guide shaft is inserted into said support portions.
 14. The spinning reel as set forth in claim 13, wherein said retainer member is a snap ring detachably and elastically locked in said annular groove.
 15. The spinning reel as set forth in claim 13, wherein said retainer member is a retaining spring formed by bending a metal wire into a hairpin contour, and locked detachably and elastically in said annular groove.
 16. The spinning reel as set forth in claim 12, wherein: said reel unit includes a reel body having a housing space in the interior thereof, and a lid member detachably fixed to said reel body and closing said housing space; and said position-restricting portion includes an annular groove formed on an outer circumference-of said guide shaft and a plate-shaped member having a U-shaped groove that is detachably and reattachably fitted to said annular groove, said plate-shaped member being pressed toward said guide shaft by said lid member.
 17. The spinning reel as set forth in claim 13, wherein said retainer member is contacting one of said plurality of support portions on a side closer to a side of said reel unit on which fishing line is reeled out.
 18. The spinning reel as set forth in claim 13, wherein said reel unit further includes a positioning boss, said guide shaft comes into contact with said positioning boss when said guide shaft is inserted from the rear of said reel unit, such that an insertion-direction position of said guide shaft is determined.
 19. The spinning reel as set forth in claim 13, wherein: said guide shaft has an interlocking portion formed at an insertion-direction rear end portion, said interlocking portion interlocking with one of said plurality of support portions that is at rearmost end in the insertion direction; and by interlocking of said interlocking portion into said support portion, an insertion-direction position of said guide shaft is determined.
 20. The spinning reel as set forth in claim 12, wherein: said reel unit has a plurality of support portions that are formed thereon and aligned along an axial direction, said guide shaft being inserted, along the axial direction of said guide shaft, through said plurality of support portions such that an outer surface of said guide shaft is entirely circumferentially supported by said plurality of support portions; and said position-restricting portion includes two annular grooves and two snap rings that are detachably and reattachably fitted to said annular grooves, said snap rings contacting both side surfaces of one of said plurality of support portions, such that said support portion is sandwiched by said snap rings, and disengagement of said guide shaft from said support portion is prevented in either axial direction.
 21. The spinning reel as set forth in claim 12, wherein said sliding means includes a rotating member having a cam, said rotating member being adapted to rotate around an axis substantially parallel to a rotational axis of said handle, in cooperation with rotation of said handle, and a cam-engaging groove provided on said sliding member and extending in a direction intersecting a direction of said spool shaft, said cam-engaging groove engaging said cam.
 22. The spinning reel as set forth in claim 12, wherein said shifting means includes a worm shaft disposed substantially parallel to said spool shaft, intersecting spiral grooves being formed on a surface of said worm shaft; an intermediate gear fixedly coupled to said worm shaft, said intermediate gear transmitting rotation of said handle to said worm shaft; and an engaging member pivotably accommodated in said sliding member and engaging said worm shaft. 